I apologize if this has been discussed many times before.

As a long term solution to malleable transactions, wouldn't it be possible to modify the signatures to be of the entire transaction.  Why do you have to zero out the inputs?  I can see that this would be a hard fork, and maybe it would be somewhat tricky to extract signatures first (since you can sign everything except the signatures), but it would seem to me that this is an important enough change to consider making.








On Wed, Feb 12, 2014 at 5:52 PM, Luke-Jr <luke@dashjr.org> wrote:
On Wednesday, February 12, 2014 8:27:52 PM Mark Friedenbach wrote:
> On 02/12/2014 08:44 AM, Alan Reiner wrote:
> > Changing the protocol to use these static IDs is a pretty fundamental
> > change that would never happen in Bitcoin.   But they can still be
> > useful at the application level to mitigate these issues.
>
> Not to mention that it would be potentially very insecure to have
> consensus depend on data (scriptSigs) which are not hashed in the Merkle
> structure of a block.
>
> Not that anyone on this list has suggested such a change, but I've seen
> it raised multiple times on the forum....

This would be a problem if it was used in the merkle tree, but I'm pretty sure
using it for input selection would be pretty safe. One could even avoid the
index by simply using the hashScript as the sole input value; then even
CoinJoins would be safe without breaking chains of transactions (although this
would break address reuse entirely - but I don't see that as a problem in a
theoretical world). One of those things that an altcoin could improve upon
Bitcoin with... ;)

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